CN101479966A - Method and device for modulating the light emission of a lighting device - Google Patents
Method and device for modulating the light emission of a lighting device Download PDFInfo
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- CN101479966A CN101479966A CNA2007800244983A CN200780024498A CN101479966A CN 101479966 A CN101479966 A CN 101479966A CN A2007800244983 A CNA2007800244983 A CN A2007800244983A CN 200780024498 A CN200780024498 A CN 200780024498A CN 101479966 A CN101479966 A CN 101479966A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
Abstract
The invention relates to controlling a lighting device, particularly to the modulation of light generated by a solid state lighting (SSL) device. The invention provides a method and device for modulating the light emission of a lighting device by keying each pulse (14) of a sequence of pulses (16) contained in the control signal (10) according to a spreading code. Thus, the light emission of a lighting device may be identified by detecting the spreading code used for modulating the light emission. The invention is particularly suitable for lighting means containing several lighting devices such as a LED lighting board with dozens of LEDs since the light emission of each lighting device may be detected by the spreading code used for modulating the light emission.
Description
Technical field
The present invention relates to the light emission of luminaire is modulated, specifically, relate to the modulation of solid luminescent (SSL) light that equipment generated.
Background technology
The light source that comprises some independent luminaires (for example LED luminous plaque or module) is just becoming and is becoming more and more popular.LED luminous plaque or module typically comprise some independent controlled LED.The advantage that has the life-span longer as the LED of luminaire than traditional luminaire (for example bulb or Halogen lamp LED).In addition, LED has the high-speed switch time, and can be controlled by low-voltage electronic signal (for example rectangular pulse shape signal).More complicated light source comprises controller, and the light emission that it can change the luminaire that comprises in the light source according to particular constraints for example makes light launch deepening according to ambient light.
WO02/25842A2 discloses a kind of LED system, and it adopts pulse-width modulation (PWM) to control illumination intensity, and adopts pulse-code modulation (PCM) that the light of emission is modulated, thereby its carrying is used for the data of RFDC.In this system, control signal is provided for LED.This control signal is controlled LED illumination and transfer of data.The illumination intensity of LED is controlled by the duty ratio or average " unlatching " time of control signal.This control signal is further by data signal modulation, the duty ratio of the signal of retentive control simultaneously, thus during transfer of data, the intensity of LED is still controlled.By pwm control signal that is used for illumination intensity and the PCM control signal that is used for transfer of data are carried out the modulation that XOR (XOR) is carried out control signal.According to WO02/25842A2, be not to be used for, but can also use pulse position modulation (PPM) that control signal is modulated the PCM of data signal modulation on the control signal.
Summary of the invention
The object of the present invention is to provide a kind of being used for to improving one's methods and equipment that the light emission of luminaire is modulated.
In order to realize purpose defined above, the invention provides a kind of method that emission is modulated to the light of luminaire that is used for, wherein, described method comprises following property feature:
-generate control signal, being used to control the light emission of described luminaire,
-described control signal comprises a plurality of frames that equate the duration,
Each frame of-described control signal can comprise the pulse that is used to connect or disconnect described luminaire,
The spreading code that-basis is used for the light emission of described luminaire is modulated is to described control
Keying is carried out in each pulse in the pulse train that is comprised in the system signal.
In order to realize the purpose of above definition, the present invention further provides a kind of equipment that emission is modulated to the light of luminaire that is used for, this equipment comprises:
-control signal generating apparatus, it is used to generate control signal to be used to control the light emission of luminaire, wherein
-described control signal comprises a plurality of frames that equate the duration,
Each frame of-described control signal can comprise the pulse that is used to connect or disconnect described luminaire,
-described control signal generating apparatus is applicable to: according to the spreading code that is used for the light emission of described luminaire is modulated keying is carried out in each pulse in the pulse train that described control signal comprised.
Property feature according to the present invention provides following advantage: the modulated light of launching from luminaire can comprise the low volume data of form of keying of each pulse of the pulse train with spreading code.The data of this amount can be preferably used for easily discerning the light from specific luminaire emission.Can carry out identifying operation by the spreading code that detection is used for the pulse of described control signal is carried out keying.Further, by utilizing spreading code (for example, it is used for for example code division multiple access (CDMA) mobile telephone system) pulse of control signal is carried out keying and therefore the light of being launched carried out keying, might among a plurality of luminaires, discern luminaire, for example by the light that specific LED launched that is comprised in the luminous plaque with a plurality of LED.This provides the light of being launched that will modulate according to the present invention to be applied to for example create the large-scale possibility of self adaptation light source.In addition, by detecting the light of luminaire emission, the present invention allows to control more accurately luminaire, the light of being launched (for example its intensity) especially, and allow to adjust for example duty ratio of the control signal of luminaire, to adjust luminous intensity.
Comprise that at this employed term " luminaire " its light emission can be controlled by the luminaire (for example SSL, for example LED or semiconductor laser diode) of pulse train.In principle, allow fast modulation, especially have each luminaire of high-speed switch time and be suitable for purpose of the present invention.For example, suitable device also can be organic LED (OLED) or fluorescent lamp or HID lamp.Under the situation of HID lamp and fluorescent lamp, can preferably not choose the luminous intensity level that is used to modulate of connecting and disconnecting fully fully, but choose two light level of non-zero, but they are different from fully to allow to be come they are distinguished by electronic detectors.
This employed " connecting or disconnecting luminaire " is not its meaning to be restricted to disconnect fully or (for example disconnection=0% of connection equipment, connect=100%), but also expression can be defined as the intensity rank of luminaire of intensity level of the equipment of the equipment that disconnects or connection respectively.In other words, " connecting or disconnecting luminaire " switches luminaire between this is illustrated in the different stage of the light intensity of being launched.Especially for the HID lamp, when the HID lamp was connected, disconnection can be represented the HID lamp is powered 90%, rather than 100%.Therefore, can prevent to rekindle the HID lamp.Under the situation of LED, between 100% and 90%, LED is switched the more performance that may cause led light source efficient as luminaire.
According to another embodiment of the present invention, the specific starting position in each frame can be distributed to the pulse of control signal.This allows not only by being identified for the pulse of the control signal of luminaire is carried out the spreading code of keying, but also by determining to distinguish the light emission of specific luminaire about the starting position of the photoemissive pulse of the frame luminaire regularly that is used for control signal.
Representative instance will be to can be used as the waveform that modulation scheme is applied to the pulse of control signal, thereby the only part of each frame is used for modulation, to allow by combination CDMA spreading code and/or by similarly using the different starting positions of the interior pulse of frame with TDMA (time division multiple access) and will separating from the emission of not sharing the same light of different luminaires.In a representative instance, can only provide the purpose of a part to be used to modulate of frame, and another part that frame is provided is to be used for illumination purposes.In another example, be not that a part of reserving frame is used for modulation, but can carry out modulation yet by the starting position that changes the pulse in their each frames.Can be used for the waveform that paired pulses carries out the spreading code of keying by application examples such as definition and carry out modulation.Specifically, described waveform can be the spreading code self that keying is carried out in each pulse of being used for pulse train that control signal is comprised.
According to the embodiment of the invention, pulse position modulation PPM or on-off keying OOK can be applied to the pulse of control signal as modulation scheme.
According to the embodiment of the invention, when using OOK as modulation scheme, pulse can comprise: first, and it is provided to be used for the OOK keying; And second portion, it is provided to be used to control the illumination of luminaire.In fact, this also can be interpreted as a kind of PWM, and wherein, both determine the pulse duration data and illumination, thereby make illumination determine typical pulse width, and data are determined the actual value in each particular frame.
According to the embodiment of the invention, when using PPM, can select the original position of pulse in the frame according to the keying mode as modulation scheme.
According to the embodiment of the invention, can choose typical pulse width, thereby obtain desired illumination.
According to another embodiment of the present invention, can by generation be used for the control signal of each luminaire and with unique each control signal of frequency spreading code division dispensing and to the light of some luminaires emission modulate.For example, the present invention allows to control each LED of the luminous plaque with a plurality of LED, and especially, the intensity of each LED can be controlled individually.
According to another embodiment of the present invention, the starting position of the pulse in the frame of at least one first control signal is different from the starting position of the pulse in the frame of at least one second control signal.Therefore, can be not only separate from the emission of the light of different luminaires by their spreading code that is used for the pulse of each control signal being carried out keying, and can separate by determining their position in the frame, compare with the situation of using different spreading codes that control signal is carried out keying, this allows to distinguish how different luminaires.For example, if the CDMA spreading code is used to keying is carried out in the pulse of control signal, then the different starting positions of the pulse of different control signals can be counted as the TDMA method, to be used to distinguish the light emission from different luminaires.
According to another embodiment of the present invention, a kind of computer program is provided, wherein, described computer program can be carried out the method according to this invention when it is carried out by computer.For example, described computer program can generate control signal by digital form, and the control signal that is generated subsequently can be output to the specific LED of luminaire (for example LED) or luminous plaque by the interface of computer.
According to the embodiment of the invention, can provide a kind of record carrier (for example CD-ROM, DVD, storage card, floppy disk or similar storage medium), to be used for storage according to computer program of the present invention.
Another embodiment of the present invention provides a kind of computer, and it can be programmed with execution the method according to this invention, and can comprise the control signal generating apparatus that is used to control at least one luminaire.Can be for example by being used for that the interface card of described computer and the coupling of one or more luminaire is realized described control signal generating apparatus, to be used to control the light emission of these luminaires.Representative instance can be the luminous plaque that comprises several thousand LED, and wherein, each among the LED can be controlled by the computer of carrying out the program that realizes the method according to this invention.
According to another embodiment of the present invention, a kind of method that is used for generating by at least one luminaire the self adaptation illumination is provided, wherein, can modulate the light emission of described at least one luminaire according to aforesaid method of the present invention, and illumination is carried out adaptive by the light of being launched by described at least one luminaire being detected, and depended on detected light and light emission is modulated according to the predetermined control algorithm by the spreading code that is assigned to described luminaire.This embodiment allows to realize for example depending on that the self adaptation of predetermined control algorithm is luminous.For example, described control algolithm can be implemented to estimate detected light and to modulate according to by the luminous function that described control algolithm was realized light being launched.Described control algolithm allows to realize various luminous functions, for example to control the illumination of luminaire according to surround lighting.
According to the embodiment of the invention, can provide a kind of according to equipment of the present invention, wherein, described control signal generating apparatus is applicable to execution the method according to this invention.
According to another embodiment of the present invention, described equipment can comprise a plurality of luminaires, and described control signal generating apparatus goes for generating the control signal of respective amount to be used for luminaire.Preferably, the control signal that some generated depends on their spreading code, thereby can distinguish from described luminaire light of launching and the light of launching from other luminaire.
According to another embodiment of the present invention, described control signal generating apparatus can comprise:
-signal source, it is applicable to that generation is used for the baseband signal of specific luminaire,
-spreading code generating apparatus, it is applicable to that generation is assigned to the spreading code of specific luminaire,
-composite set, it is provided to baseband signal that will be generated by described signal source and the spreading code that is generated by the spreading code generating apparatus and is combined as chip sequence,
-pulse generator, it is applicable to according to described chip sequence and generates modulated control signal,
-intensity controller, it is applicable to the photoemissive intensity of control.
Can for example realize described control signal generating apparatus by the algorithm of carrying out by processor.Yet, also can be for example in hardware, realize them with the form that comprises according to the LED luminous plaque microcontroller of equipment of the present invention, wherein, the control signal generating apparatus is used for directly controlling the LED of LED luminous plaque.
At last, according to another embodiment, the present invention relates to a kind of detector device that is used to detect the light of being modulated by the method according to this invention, wherein, described detector device comprises:
-light receiving unit, it for example comprises light sensor (for example photodiode), and it is applicable to the reception modulated light, and modulated light is converted to the corresponding modulated signal of telecommunication,
-modulating unit, it is applicable to according to spreading code the described modulated signal of telecommunication is carried out demodulation, described spreading code is used for the control signal that is used to generate described modulated light is modulated,
-processing unit, it is applicable to the signal of telecommunication of handling described demodulation.
By and with reference to the embodiments described below, these and other aspect of the present invention will be illustrated and be become clear.
Hereinafter the present invention is described in more detail with reference to exemplary embodiment.Yet, the invention is not restricted to these exemplary embodiments.
Description of drawings
Fig. 1 illustrates the example according to the pulse of control signal of the present invention;
Fig. 2 illustrates the example according to two pulses of the present invention, and wherein, these two pulses have different sign indicating numbers and according to PPM and modulated;
Fig. 3 illustrates the example according to two pulses of the present invention, and wherein, these two pulses have different sign indicating numbers and according to OOK and modulated;
Fig. 4 illustrates the example by PPM and the pulse train of modulating according to the present invention by digital code " 0110 " keying;
Fig. 5 illustrates the example by OOK and the pulse train of modulating according to the present invention by digital code " 0110 " keying;
Fig. 6 illustrates the block diagram according to the embodiment of the transmitter architecture that is used for the equipment that emission is modulated to the light of luminaire of the present invention;
Fig. 7 illustrates according to LED light emitting array of the present invention and is used to control luminous control loop.
Embodiment
Below, by describing the present invention with LED as the embodiment of light-emitting device, but this should not be construed as and limits the invention.
According to the present invention, provide a kind of high efficiency method to carry out two functions simultaneously:
-come the self adaptation light modulation of the light of light emitting device;
-via the light of luminaire data are transmitted.Luminous intensity can change between almost nil and almost whole power.
The design of communications function, thus make among many (for example several thousand) LED each can carry low volume data.For example can use data flow by variety of way from all LED, thus identification LEDs and the control data that uses in the illuminator exchanged uniquely.Another Application can be, all (or a lot) LED jointly carries a high-speed data signal, and each LED carries a part of data separately.
The example of application of the present invention for example is:
The illumination of-self adaptation: transducer is measured the light contribution from each LED in real time, to optimize illumination setting adaptively.
-traffic lights wherein, comes light is modulated by local (traffic) information.Here, traffic light systems should allow illumination to be set to approach maximum available power, spends the sub-fraction lighting power simultaneously and comes by data light to be modulated.
-comprise headlight and the back light of LED as the vehicle of luminaire, wherein, can modulate the light of emission, thereby it sends to for example another vehicle with data.
-museum or shop, wherein, by sending through respectively the luminaire of illumination being modulated the explanation that produces, the explanation about the object that is displayed is carried in described illumination.
Thereby-measure " distance " of a large amount of luminaires and position by measuring propagation loss indoor.
-test run (commissioning): after luminaire being installed, using modulator approach to discern each LED and send light wherein.
Typically by quick connection and disconnect the light modulation that LED finishes solid luminescent (SSL) equipment (for example LED), thereby the duty ratio (being defined as the ratio p (0≤p≤1) of time) when LED connects is guaranteed an amount of light.
For the lightwave communication of data, can use the various modulator approaches that to describe at this.Specifically, pulse-width modulation (PWM) and pulse position modulation (PPM) are suitable principles.
The present invention relates to this situation: luminaire not only is used for illumination purposes, but also is used for communication.Specifically, can satisfy great majority in the following demand according to the photoemissive modulator approach of luminaire of the present invention:
-switch switches, and adds amplitude control (" controlling " efficiency curve of luminaire with optimally);
-modulation need not average duty ratio p is worked: p is stipulated by required illumination;
-there is not a visible flicker (sign indicating number that does not for example have DC);
-each switching (close out, reach the pass) can be created the heat of CV2/2: the fixed budget (effective capacitance of C:LED, the voltage on the V:LED) that is used for transition;
-switching manipulation should not cover a few percent above pulse to prevent color change;
-the dimming scope of 1:256 (8 bit) at least;
If-LED is used as luminaire, bandwidth constraint then;
-permission is to the Multiuser Detection of several thousand LED, the robustness of anti-phase mutual interference;
The robustness of-anti-ambient lighting;
If-use quick SSL equipment, then allow than 200 milliseconds of controls that time constant is thrown light on faster.
For implementation of the present invention, generate comprise at least one pulse as Fig. 1 to control signal 10 shown in Figure 5, to be used to control LED.By the present invention, the throughput of per second f bit can be realized with the LED of frequency f clock, and n independent measurement of per second can be carried out simultaneously from the illumination of l LED, thereby multiply by l, n equals f.
Modulator approach of the present invention can be counted as the form of PWM, wherein, according to spreading code keying is carried out in each pulse.In addition, not only can access code, can also choose the starting position of pulse, to hold the many different transmitter in the luminescent system that comprises some luminaires that are subjected to method control of the present invention.Further, can choose typical pulse width arbitrarily, to satisfy the illumination standard.
To use following note for time scale (also with reference to Fig. 1 and Fig. 4 and Fig. 5, Fig. 1 illustrates the typical pulse of the photoemissive control signal that is used to control LED, and Fig. 4 and Fig. 5 illustrate the typical pulse sequence 16,22,24 of control signal 10) at this:
-T
1(T
1=1/f) expression can be used to connect and disconnect the meticulousst temporal resolution of LED.For example, T
1Can be tens nanoseconds, but use that it can be enough to the LED clock is located at about 1 microsecond usually for illumination control.
-T
2=N
1T
1Expression can be held the duration at the interval of the making operation of LED and an opening operation.Period T
2Be called as frame 12.
-T
3=N
2T
2Expression is used for the transmission of a user symbols (special code, example digital code " 0110 " as shown in Figure 4 and Figure 5) or is used for the time interval of the one-shot measurement of optical channel transformation.
According to the present invention, can design luminescent system, thereby by comprising N
1Individual unit interval T
1Period T
2The waveform of the control signal 10 of definition can satisfy the illumination constraint, thereby illumination is in (on average)
Be switched on during the individual unit interval, wherein,
Be i period iT
3..., (i+1) T
3In the duty ratio of l LED.Can be by duration T
3The sequence of coding carry the payload user data of the signal that sends by LED, T
3Comprise N
2Individual each duration T
2These basic pulses.
In embodiments of the present invention, each LED can send the time division multiplexing combination of signal S1 that is mainly used in data communication and the burst S2 that is mainly used in the illumination of satisfying required illumination intensity thereafter.Owing to carry data by come a part (being signal S1) to the pulse that is used to control LED to connect or disconnect operation according to data to be lifted, so the modulation scheme that is suitable for this purpose is on-off keying (OOK) scheme.Yet, also can realize the data communication function of control signal by another modulation scheme (for example pulse position modulation (PPM)).Describe in more detail according to modulation scheme PPM of the present invention after a while.Also can use other pulse shape (for example return-to-zero pulse) in principle.Some light source preferably amplitude is modulated, and has less modulation depth, rather than disconnects light source fully in some interim.
The control signal that is used for each LED has duration kT
1The periodicity time interval---frame (label 12 among Fig. 1)---its each T of second
2(T
2KT
1) be repeated second, wherein, it can send a chip of data based on OOK.For " 1 " chip, light is switched " on ", and for " 0 " chip, light is by " disconnection ", and k is a positive integer, preferably k=1.
For many groups N
2Individual continuous chip carries out Methods for Coding can guarantee that the ratio between the quantity of 1 chip and 0 chip is a constant.Therefore preferably, this ratio is q=1/2, has " 0 " of 50% " 1 " and " 50% ".
The duration of S2 can followingly be set:
Suppose that the required illumination from LED is such: the duty ratio of LED need be
The data-modulated of LED will be measured k/ (2 N
1) contribute and give average duty ratio.And the T of duration
2All the other sub-period (T
2-1/ (2 N
1)) can be used for illumination.Therefore, preferably
If, but allow LED only in the son interval of the period of distributing, to connect for data-modulated, then can realize the value outside this interval.For the optimum performance of Data Detection, at each T
3Interim,
Value preferably be fixed.
Fig. 1 illustrates the basic configuration as " lighting power " that offer LED of rectangular pulse.Pulse 14 is positioned at the frame 12 according to the control signal 10 of the embodiment of the invention.The first 18 of pulse (time slot 4 among Fig. 1 and time slot 5 k=2) are exclusively used in the OOK data-modulated, and second portion 20 (all the other time slots 6,7 ...) be exclusively used in and control illumination.Therefore by the 18 carrying signal S1 of first of pulse 14, by the second portion 20 carrying signal S2 of pulse 14.The product of pulse duration and pulse amplitude is identified for the power of the desired illumination of LED.In normal running, this pulse is with T
2Frame period repeat.Fig. 3 illustrates the different pulses 14 that are used for chip " 0 " and chip " 1 ".In the upper diagram of Fig. 3, the pulse 14 that is used for chip " 0 " has the first 18 that has high level, and in the bottom graph of Fig. 3, and the pulse that is used for chip " 1 " has and has low level first 18.The second portion 20 of these two pulses 14 always is in high level, and determines luminous intensity in fact.
Be applied to comprising the luminaire of some LED, timing slip τ
ι 1(wherein, τ
ι 1∈ 0,1 ..., N
1-1}), can define the data-modulated position partly of the pulse of LED l.If LED uses different positions for modulation, then their data-signal falls into different intervals, and can be separated by detector, will describe detector after a while.
Be not to use to have Fig. 1 and the first shown in Figure 3 and the pulse 14 of second portion, but can use the PPM modulation scheme by paired pulses, as Fig. 2 and shown in Figure 4.In Fig. 2, two pulses 14 of " 0 " and " 1 " are shown, wherein, be depended on pulse starting position 26 by the pulse data carried by data.In other words, PPM is used to modulate data on the pulse 14 of control signal 10.In Fig. 2, at the pulse shown in the upper diagram 14 carrying chips " 0 ", and in time slot shown in Figure 20, than the pulse shown in the bottom graph 14 at time frame T
2In beginning more early, pulse 14 carrying chips " 1 " shown in the bottom graph and begin to postpone kT with respect to frame 12
1And begin.Modulation scheme shown in Figure 2 has the following advantages: the electric flux that is offered LED by pulse 14 in each frame 12 is a constant, and with OOK chopping phase ratio, do not rely on by the pulse data carried by data, owing to depend on institute's data carried by data by OOK modulating pulse 14, the energy that therefore offers LED depends on the pulse data carried by data.Yet for OOK, if the ratio of the quantity of " 0 " and " 1 " in the sign indicating number is known, typical pulse width is a constant.Preferably, orthogonal code sets can be used, and complete " 1 " (or DC (direct current) sign indicating number) can be got rid of.In the case, all the other employed sign indicating number is no DC, and comprises " 0 " and " 1 " of equal number by definition.Guaranteed like this for each interval T
3, the duration that average duty ratio equals bright pulse adds half of duration of the data-modulated part of pulse.
Now, about Fig. 4 and Fig. 5, how explanation can carry out keying according to spreading code to the pulse train 16 of control signal 10, be used for to according to the light of LED of the present invention emission modulate.The modulated light emission can send for example data of 1 bit.At this employed spreading code is the sign indicating number " 0110 " of 4 chips of weak point.Pulse train 16 is used at least one of following two purposes:
-Data transmission, for example information bit
-permission detectors measure is from the local strength of the illumination of this LED.
In Fig. 4, PPM is applied to the pulse 14 of sequence as modulation scheme, and in Fig. 5, OOK is used as modulation scheme.
In Fig. 4, first pulse of sequence 16 and the 4th pulse 14 begin in beginning place of their frames separately of indication " 0 " chip, and second pulse of sequence 16 and the 3rd pulse 14 are from the beginning delay kT of the frame of indication " 1 " chip
1(k=2) begin.
In Fig. 5, first pulse of sequence 16 and the 4th pulse 14 have the pulse duration of five time slots, and postpone kT from their beginning of each frame of indication " 0 " chip
1(k=2) begin, and second pulse and the 3rd pulse 14 only have the pulse duration of three time slots, and from indication " 1 " chip they each frame begin to postpone kT
1(k=4) begin.
In Fig. 4 and Fig. 5, comprise N
2The complete code length of=4 chips has T
3(T
3=4T
2) cycle.In this cycle, the actual information of a bit can be delivered to receiver.Can send the bit of opposite polarity by the complement form (" 1001 ") of using this yard.If the eliminating all-ones is then during this cycle, even N
2-2 other LED use the same position τ in the frame
ι 1Locate their data, they also can send a bit.In addition, by with N
1Other one group of LED, N are distributed to in/k other starting position
1/ k-1 organizes N
2-1 other LED also can each all send a bit, and allows to be used for the ionization meter of each LED.
May have a large amount of LED according to illuminator of the present invention; Therefore, different sign indicating numbers (being also referred to as signature at this) must be distributed to different LED, with the signal (being the light emission of each LED) that separates them.In other words,, can adopt code division multiple access method (CDMA), coexist as in the system to guarantee different LED, and can not cause interfering with each other according to the present invention.Especially easily be orthogonal code, multi-user interference (MUI) was zero when it had guaranteed to keep synchronous when running through system.For this reason, all LED and photodetector can the sharing of common clocks.Practical methods can be passed through the pulse of power circuit tranmitting data register, so that all LED are synchronous.Can periodically make detector synchronous by allowing all LED send the known same datum pulse of detector.In addition, coded sequence is preferably completely orthogonal, for example the Walsh-Hadamard sign indicating number.Also can use another kind of sign indicating number, i.e. linear feedback shift register (LFSR) sign indicating number.The sequence that belongs to back one class is characterised in that, is not to be entirely zero but very approach zero cross-correlation function.The advantage of LFSR is, allows to occur synchronous error, and performance is not produced significant impact.Different LED is assigned with the different cyclic shifts of same code.
Fig. 6 illustrates the block diagram that is used for the light of LED is launched the transmitter architecture of the equipment of modulating 100 according to the embodiment of the invention.Equipment 100 comprises the control signal generating apparatus that is used to generate control signal 10, and control signal is used to control the light emission 114 of LED 112.Described control signal generating apparatus comprises:
-signal source 102, its generation are used for the baseband signal b of specific LED l
i 1,
-spreading code generating apparatus 104, it generates the spread spectrum codes C of being distributed to specific LED l respectively
1,
-composite set 108, it is provided to be used for: will be by the baseband signal b of signal source 102 generations
i 1With the spreading code that generates by spreading code generating apparatus 104
Be combined as chip sequence a
I, j 1,
-pulse generator 110, it is applicable to according to described chip sequence a
I, j 1Generate modulated control signal s
1(t) 10,
-intensity controller 106, it is applicable to the photoemissive intensity of control.
In a word, can followingly write out be used for specific LED's and the modulated control signal 10 that generates by equipment 100:
Wherein, s
1 I, j, n=s
1(iT
3+ jT
2+ nT
1).At this, i represents information bit b
i 1Sequence (wherein, b
i 1∈ 1 ,-1}), and j carries out index to frame.By with current information bit b
i 1Multiply by a yard sequence C
1=(c
0 1, c
1 1..., c
j 1..., c
N1-1 1) (wherein, c
j 1∈ 1 ,-element in 1}) and obtain each chip a
I, j 1In other words, a
I, j 1=b
i 1c
j 1So whether the first that the element of data and sign indicating number influences pulse occurs, thereby it influences the starting position of the pulse in the frame.After being generated, signal of telecommunication s
1(t) be converted to light pulse by LED 112, and for example be launched subsequently by transmission channel.
As mentioned above, may have a large amount of LED according to illuminator of the present invention; Therefore different sign indicating numbers (referred to herein as " signature ") can be distributed to different LED, with signal or the light emission that separates them respectively.In other words, adopt code division multiple access method (CDMA), coexist as in the system to guarantee different LED, and can not cause interference each other.Fig. 7 illustrates the LED luminous plaque 116 with a plurality of LED as illuminator.Detect the light emission of the different LED of described plate 116 by transducer 118 (for example launching responsive photodiode) for the light of LED.For example can connect (for example according to Zigbee RF standard) via radio frequency (RF) will send to master controller 120 from transducer 118 by transducer 118 detected signals, and the 120 pairs of modulated signal of telecommunication and corresponding light that sense from transducer 118 outputs of master controller carry out demodulation.Master controller 120 can be used for launching the light emission of controlling LED according to detected light.Therefore, can realize being used to control the luminous external control ring of described plate 116.Since can be used for the spreading code that the light emission of LED is modulated is come the light emission of each LED is distinguished with the light emission of other LED by detection, therefore might be by only using the single led light emission that some transducers 118 come control board 116.
From the description of front as seen, this system has guaranteed separating according to the LED of TDMA (time division multiple access) and the combination of CDMA scheme.More accurately, if LED is l
1And l
2The same position of the modulated part of shared data
Then will use (from the orthogonal sequence set, selecting) different sign indicating number to separate their signal.Can reuse identical sequence sets and close, not produce any interference and the modulated part of its data is positioned at the LED of diverse location.Under one situation of back, will distinguish LED based on TDMA.Therefore, each LED l
1Set { τ with two values
i 1, C
1, wherein, first value representation TDMA signature, and second value representation CDMA signature.
System can distribute nearly N respectively
1/ k N
2Individual quadrature (therefore noiseless) user or signal.(the C for example because specific reasons
1=[1,1 .., 1] expression DC signal), some signature preferably keeps not distributing.The system that makes disturbs (sunlight and other LED that sends the bright pulse of LED) to have robustness at any DC to keep the DC sign indicating number not distribute, and therefore the quantity of the LED that in fact distributes can be still less.
This scheme allows the modulated part of illumination (in other words, the afterbody of pulse) of pulse to pass T
2The right margin of frame is to be provided at scope
In any duty ratio.As mentioned above, because the afterbody of pulse is represented the DC component, but sign indicating number is a quadrature for this interference, thus can finish this operation, and do not produce any interference problem.
Obvious, also can design described system, thereby the constant illumination pulse is positioned at before the data pulse just, rather than just is positioned at after the data pulse.
In addition, design system replacedly, thus bright pulse and data pulse are not connected directly.Except the transition of needs more switches, this system carries out same operation, and this does not more expect with regard to power consumption.
The representative instance of the design alternative of LED luminous plaque embodiment of the present invention is:
T
1=1 microsecond
N
1=1024 (dimming scope 10 bits)
The big or small N of sign indicating number
2=16, the sign indicating number set: walsh hadamard, except all-ones k=1
The quantity of LED: reach about 16000
Duty ratio:, arbitrarily choose by LED according to lighting demand by the house control setting.
The major advantage that the present invention has is, it allows to launch by the light of such mode modulated luminescence equipment (for example single led, a plurality of LED or comprise the luminous plaque of a plurality of LED), that is, can discern the light emission of specific luminaire by the spreading code that detection is used for photoemissive modulation.Because the emission of the light of each luminaire can detect by the spreading code that is used for photoemissive modulation and therefore control by the luminous light launch control unit (for example such as the house controller) that is applicable to the LED luminous plaque that the control house uses, so the present invention is particularly suitable for comprising the light-emitting device of some luminaires (for example having LED luminous plaques a plurality of or a hundreds of LED).Another advantage of the present invention is such option: by sending different spreading codes and/or using the different starting positions of the pulse in the frame to distinguish light from Different Light.
Should be noted that and to use the modulation of being undertaken by spreading code, and do not carry the data-signal of user profile.For example, if data sequence just is complete " 1 " sequence, then receiver still can be measured each light contribution and the control illumination from each light source.
Can carry out in the function of the present invention at least some by hardware or software, for example generate control signal being used for, or be used for generating method according to photoemissive self adaptation illumination of modulating according to the present invention by at least one luminaire according to the emission of the light of luminaire of the present invention.Under the situation of the implementation of software, can use single or multiple standard microprocessor or microcontroller to handle and be used to realize single or multiple algorithm of the present invention.
Should be noted that literal " comprises " does not get rid of other element or step, and literal " " is not got rid of a plurality of.Further, the Reference numeral in the claim should not be interpreted as limiting the scope of the invention.
Claims (17)
1. one kind is used for the light of luminaire is launched the method for modulating, wherein,
-generate control signal (10), being used to control the light emission of described luminaire,
-described control signal (10) comprises equal duration (T
2) a plurality of frames (12),
Each frame (12) of-described control signal (10) can comprise the pulse (14) that is used to connect or disconnect described luminaire, and
-according to the spreading code that is used for the light emission of described luminaire is modulated, keying is carried out in each pulse (14) in the pulse train (16) that is comprised in the described control signal (10).
2. the method for claim 1, wherein the specific starting position in each frame is distributed to the pulse of control signal.
3. method as claimed in claim 1 or 2 wherein, is applied to pulse position modulation PPM (16) or on-off keying OOK (24) pulse (14) of described control signal (10) as modulation scheme.
4. method as claimed in claim 3, wherein, for using OOK, pulse comprises: for the first (18) of OOK keying and the second portion (20) that supplies the illumination of the described luminaire of control.
5. method as claimed in claim 3 wherein, for using PPM, is selected the starting position of the pulse (26) in the frame according to keying.
6. any described method in the claim as described above wherein, is chosen typical pulse width, thereby is realized desired illumination.
7. any described method in the claim as described above, wherein, be used for by generation described luminaire each control signal and distribute unique spreading code for each control signal, come the light emission of some luminaires is modulated.
8. method as claimed in claim 7, wherein, the starting position of the pulse in the frame of at least one first control signal is different from the starting position of the pulse in the frame of at least one second control signal.
9. computer program, it can carry out the described method of claim as described above when being carried out by computer.
10. record carrier, it stores computer program as claimed in claim 9.
11. a computer, it is programmed carrying out as any described method in the claim 1 to 8, and described computer comprises the control signal generating apparatus that is used to control at least one luminaire.
12. method that is used for generating the self adaptation illumination by at least one luminaire, wherein, modulate according to any light emission in the claim 1 to 8 described at least one luminaire, and by the light of being launched by described at least one luminaire being detected by the spreading code that is assigned to described luminaire, and depend on detected light and according to the predetermined control algorithm to described light emission modulate, and carry out adaptive to illumination.
13. one kind is used for the light of luminaire (112) is launched the equipment (100) that modulate (114), comprises:
-control signal generating apparatus (102,104,106,108,110), it is used to generate control signal (10), to be used to control the light emission of described luminaire, wherein,
-described control signal (10) comprises equal duration (T
2) a plurality of frames (12),
Each frame (12) of-described control signal (10) can comprise the control impuls (14) that is used to connect or disconnect described luminaire,
-described control signal generating apparatus is applicable to: the spreading code according to being used for the light emission of described luminaire is modulated, carry out keying to each pulse (14) in the pulse train (16) that is comprised in the described control signal (10).
14. equipment as claimed in claim 13, wherein, described control signal generating apparatus (102,104,106,108,110) is applicable to: carry out as any described method in the claim 1 to 8.
15. as claim 13 or 14 described equipment, wherein it comprises a plurality of luminaires (116), and described control signal generating apparatus (102,104,106,108,110) is applicable to: the control signal that is used for described luminaire that generates respective amount.
16. as claim 13,14 or 15 described equipment, wherein, described control signal generating apparatus (102,104,106,108,110) comprising:
-signal source (102), it is applicable to that generation is used for the baseband signal of specific luminaire,
-spreading code generating apparatus (104), it is applicable to that generation is assigned to the spreading code of specific luminaire,
-composite set (108), it is provided to be used for baseband signal that described signal source (102) is generated and the spreading code that is generated by spreading code generating apparatus (104) and is combined as chip sequence,
-pulse generator (110), it is applicable to according to described chip sequence and generates modulated control signal (10), and
-intensity controller (106), it is applicable to the photoemissive intensity of control.
17. a detector device, it is used to detect the light of modulating by according to the method for claim 1 to 8, and wherein, described detector device comprises:
-light receiving unit (118), it is applicable to the described modulated light of reception, and described modulated light is converted to the corresponding modulated signal of telecommunication,
-modulating unit (120), it is applicable to according to the control signal that is used to generate described modulated light is modulated the spreading code that uses, and the described modulated signal of telecommunication is carried out demodulation,
-processing unit (120), it is applicable to the signal of telecommunication of handling described demodulation.
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| EP06116228.5 | 2006-06-28 | ||
| PCT/IB2007/052326 WO2008001262A1 (en) | 2006-06-28 | 2007-06-18 | Method and device for modulating the light emission of a lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101479966A true CN101479966A (en) | 2009-07-08 |
| CN101479966B CN101479966B (en) | 2012-04-18 |
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|---|---|---|---|
| CN2007800244983A Active CN101479966B (en) | 2006-06-28 | 2007-06-18 | Method and device for modulating the light emission of a lighting device |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US8494367B2 (en) |
| EP (1) | EP2039029B1 (en) |
| JP (1) | JP5478248B2 (en) |
| CN (1) | CN101479966B (en) |
| AT (1) | ATE463095T1 (en) |
| DE (1) | DE602007005647D1 (en) |
| ES (1) | ES2343338T3 (en) |
| WO (1) | WO2008001262A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE602007005647D1 (en) | 2010-05-12 |
| US20090196613A1 (en) | 2009-08-06 |
| ATE463095T1 (en) | 2010-04-15 |
| EP2039029B1 (en) | 2010-03-31 |
| US8494367B2 (en) | 2013-07-23 |
| ES2343338T3 (en) | 2010-07-28 |
| WO2008001262A1 (en) | 2008-01-03 |
| CN101479966B (en) | 2012-04-18 |
| JP5478248B2 (en) | 2014-04-23 |
| JP2009542497A (en) | 2009-12-03 |
| EP2039029A1 (en) | 2009-03-25 |
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